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There are 3 bags B1,B2 and B3 having res...

There are 3 bags `B_1,B_2` and `B_3` having respectively 4 white, 5 black, 3 white, 5 black and 5 white, 2 black balls. A bag is chose at random and a ball is drawn from it. Find the probability that the ball is white.

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